When building or rebuilding a Visual Studio 2008 Solution the output window shows: Error 1 System error - failure during ILASM phase. Installation of a different Micro Focus WrapPack is irrelevant. We are using Net Express version 5.1.

These errors are not very descriptive and general, they could occur due to various different reasons but in this case it was solved by making sure the account being used had sufficient access rights to the files and Windows Operating System, also importantly the domain it was logged into, Full Administrator access would be preferable. If the files are located on a network drive the domain access rights play an important role, sufficient access rights are needed to rebuild/rebuild Visual Studio 2008 Solutions.